【摘 要】
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Dexmedetomidine(DEX),a potent and highly selective agonist for α2-adrenergic receptors(α2AR),exerts neuroprotective effects by reducing apoptosis through decreased neuronal Ca2+influx.However,the exact action mechanism of DEX and its effects on oxygen-glu
【机 构】
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Department ofAnesthesiology, Renmin Hospital of Wuhan University, Wuhan 430060, China;Department ofA
论文部分内容阅读
Dexmedetomidine(DEX),a potent and highly selective agonist for α2-adrenergic receptors(α2AR),exerts neuroprotective effects by reducing apoptosis through decreased neuronal Ca2+influx.However,the exact action mechanism of DEX and its effects on oxygen-glucose deprivation-reoxygenation(OGD/R)injury in vitro are unknown.We demonstrate that DEX pretreatment reduced OGD/R injury in PC 12 cells,as evidenced by decreased oxidative stress,autophagy,and neuronal apoptosis.Specifically,DEX pretreatment decreased the expression levels of stromal interaction molecule 1(STIM1)and calcium release-activated calcium channel protein 1(Orai 1),and reduced the concentration of intracellular calcium pools.In addition,variations in cytosolic calcium concentration altered apoptosis rate of PC12 cells after exposure to hypoxic conditions,which were modulated through STIM1/Orail signaling.Moreover,DEX pretreatment decreased the expression levels of Beclin-1 and microtubule-associated protein lA/lB-light chain 3(LC3),hallmark markers of autophagy,and the formation of autophagosomes.In conclusion,these results suggested that DEX exerts neuroprotective effects against oxidative stress,autophagy,and neuronal apoptosis after OGD/R injury via modulation of Ca2+-STIM1/Orai1 signaling.Our results offer insights into the molecular mechanisms of DEX in protecting against neuronal ischemia-reperfusion injury.
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